I think everyone is busy (either fixing or enjoying pools). :-)
I don't think it's a safe assumption to make that a stream contains no metals. My guess is that a stream is very likely to contain metals. I have read elsewhere that iron can turn the water green, so I would check threads for metals and try to determine if iron is the culprit. My knowledge on this is very limited, but that's where I would start if it were me.
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